<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>仿腾讯微博效果</title>
    <style type="text/css">
        body,
        div,
        h2,
        h3,
        ul,
        li,
        p {
            margin: 0;
            padding: 0;
        }

        a {
            text-decoration: none;
        }

        a:hover {
            text-decoration: underline;
        }

        ul {
            list-style-type: none;
        }

        body {
            color: #333;
            background: #3c3a3b;
            font: 12px/1.5 \5b8b\4f53;
        }

        #msgBox {
            width: 500px;
            background: #fff;
            border-radius: 5px;
            margin: 10px auto;
            padding-top: 10px;
        }

        #msgBox form h2 {
            font-weight: 400;
            font: 400 18px/1.5 \5fae\8f6f\96c5\9ed1;
        }

        #msgBox form {
            background: url(img/boxBG.jpg) repeat-x 0 bottom;
            padding: 0 20px 15px;
        }

        #userName,
        #conBox {
            color: #777;
            border: 1px solid #d0d0d0;
            border-radius: 6px;
            background: #fff url(img/inputBG.png) repeat-x;
            padding: 3px 5px;
            font: 14px/1.5 arial;
        }

        #userName.active,
        #conBox.active {
            border: 1px solid #7abb2c;
        }

        #userName {
            height: 20px;
        }

        #conBox {
            width: 448px;
            resize: none;
            height: 65px;
            overflow: auto;
        }

        #msgBox form div {
            position: relative;
            color: #999;
            margin-top: 10px;
        }

        #msgBox img {
            border-radius: 3px;
        }

        #face {
            position: absolute;
            top: 0;
            left: 172px;
        }

        #face img {
            width: 30px;
            height: 30px;
            cursor: pointer;
            margin-right: 6px;
            opacity: 0.5;
            filter: alpha(opacity=50);
        }

        #face img.hover,
        #face img.current {
            width: 28px;
            height: 28px;
            border: 1px solid #f60;
            opacity: 1;
            filter: alpha(opacity=100);
        }

        #sendBtn {
            border: 0;
            width: 112px;
            height: 30px;
            cursor: pointer;
            margin-left: 10px;
            background: url(img/btn.png) no-repeat;
        }

        #sendBtn.hover {
            background-position: 0 -30px;
        }

        #msgBox form .maxNum {
            font: 26px/30px Georgia, Tahoma, Arial;
            padding: 0 5px;
        }

        #msgBox .list {
            padding: 10px;
        }

        #msgBox .list h3 {
            position: relative;
            height: 33px;
            font-size: 14px;
            font-weight: 400;
            background: #e3eaec;
            border: 1px solid #dee4e7;
        }

        #msgBox .list h3 span {
            position: absolute;
            left: 6px;
            top: 6px;
            background: #fff;
            line-height: 28px;
            display: inline-block;
            padding: 0 15px;
        }

        #msgBox .list ul {
            overflow: hidden;
            zoom: 1;
        }

        #msgBox .list ul li {
            float: left;
            clear: both;
            width: 100%;
            border-bottom: 1px dashed #d8d8d8;
            padding: 10px 0;
            background: #fff;
            overflow: hidden;
        }

        #msgBox .list ul li.hover {
            background: #f5f5f5;
        }

        #msgBox .list .userPic {
            float: left;
            width: 50px;
            height: 50px;
            display: inline;
            margin-left: 10px;
            border: 1px solid #ccc;
            border-radius: 3px;
        }

        #msgBox .list .content {
            float: left;
            width: 400px;
            font-size: 14px;
            margin-left: 10px;
            font-family: arial;
            word-wrap: break-word;
        }

        #msgBox .list .userName {
            display: inline;
            padding-right: 5px;
        }

        #msgBox .list .userName a {
            color: #2b4a78;
        }

        #msgBox .list .msgInfo {
            display: inline;
            word-wrap: break-word;
        }

        #msgBox .list .times {
            color: #889db6;
            font: 12px/18px arial;
            margin-top: 5px;
            overflow: hidden;
            zoom: 1;
        }

        #msgBox .list .times span {
            float: left;
        }

        #msgBox .list .times a {
            float: right;
            color: #889db6;
            display: none;
        }

        .tr {
            overflow: hidden;
            zoom: 1;
        }

        .tr p {
            float: right;
            line-height: 30px;
        }

        .tr * {
            float: left;
        }

    </style>
    <script type="text/javascript">
        /*-------------------------- +
                  获取id, class, tagName
                 +-------------------------- */
        var get = {
            byId: function(id) {
                return typeof id === "string" ? document.getElementById(id) : id
            },
            byClass: function(sClass, oParent) {
                var aClass = [];
                var reClass = new RegExp("(^| )" + sClass + "( |$)");
                var aElem = this.byTagName("*", oParent);
                for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);
                return aClass
            },
            byTagName: function(elem, obj) {
                return (obj || document).getElementsByTagName(elem)
            }
        };
        /*-------------------------- +
          事件绑定, 删除
         +-------------------------- */
        var EventUtil = {
            addHandler: function(oElement, sEvent, fnHandler) {
                oElement.addEventListener ? oElement.addEventListener(sEvent, fnHandler, false) : (oElement["_" + sEvent + fnHandler] = fnHandler, oElement[sEvent + fnHandler] = function() {
                    oElement["_" + sEvent + fnHandler]()
                }, oElement.attachEvent("on" + sEvent, oElement[sEvent + fnHandler]))
            },
            removeHandler: function(oElement, sEvent, fnHandler) {
                oElement.removeEventListener ? oElement.removeEventListener(sEvent, fnHandler, false) : oElement.detachEvent("on" + sEvent, oElement[sEvent + fnHandler])
            },
            addLoadHandler: function(fnHandler) {
                this.addHandler(window, "load", fnHandler)
            }
        };
        /*-------------------------- +
          设置css样式
          读取css样式
         +-------------------------- */
        function css(obj, attr, value) {
            switch (arguments.length) {
                case 2:
                    if (typeof arguments[1] == "object") {
                        for (var i in attr) i == "opacity" ? (obj.style["filter"] = "alpha(opacity=" + attr[i] + ")", obj.style[i] = attr[i] / 100) : obj.style[i] = attr[i];
                    } else {
                        return obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj, null)[attr]
                    }
                    break;
                case 3:
                    attr == "opacity" ? (obj.style["filter"] = "alpha(opacity=" + value + ")", obj.style[attr] = value / 100) : obj.style[attr] = value;
                    break;
            }
        };

        EventUtil.addLoadHandler(function() {
            var oMsgBox = get.byId("msgBox");
            var oUserName = get.byId("userName");
            var oConBox = get.byId("conBox");
            var oSendBtn = get.byId("sendBtn");
            var oMaxNum = get.byClass("maxNum")[0];
            var oCountTxt = get.byClass("countTxt")[0];
            var oList = get.byClass("list")[0];
            var oUl = get.byTagName("ul", oList)[0];
            var aLi = get.byTagName("li", oList);
            var aFtxt = get.byClass("f-text", oMsgBox);
            var aImg = get.byTagName("img", get.byId("face"));
            var bSend = false;
            var timer = null;
            var oTmp = "";
            var i = 0;
            var maxNum = 140;

            //禁止表单提交
            EventUtil.addHandler(get.byTagName("form", oMsgBox)[0], "submit", function() {
                return false
            });

            //为广播按钮绑定发送事件
            EventUtil.addHandler(oSendBtn, "click", fnSend);

            //为Ctrl+Enter快捷键绑定发送事件
            EventUtil.addHandler(document, "keyup", function(event) {
                var event = event || window.event;
                event.ctrlKey && event.keyCode == 13 && fnSend()
            });

            //发送广播函数
            function fnSend() {
                var reg = /^\s*$/g;
                if (reg.test(oUserName.value)) {
                    alert("\u8bf7\u586b\u5199\u60a8\u7684\u59d3\u540d");
                    oUserName.focus()
                } else if (!/^[u4e00-\u9fa5\w]{2,8}$/g.test(oUserName.value)) {
                    alert("\u59d3\u540d\u75312-8\u4f4d\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\u3001\u6c49\u5b57\u7ec4\u6210\uff01");
                    oUserName.focus()
                } else if (reg.test(oConBox.value)) {
                    alert("\u968f\u4fbf\u8bf4\u70b9\u4ec0\u4e48\u5427\uff01");
                    oConBox.focus()
                } else if (!bSend) {
                    alert("\u4f60\u8f93\u5165\u7684\u5185\u5bb9\u5df2\u8d85\u51fa\u9650\u5236\uff0c\u8bf7\u68c0\u67e5\uff01");
                    oConBox.focus()
                } else {
                    var oLi = document.createElement("li");
                    var oDate = new Date();
                    oLi.innerHTML = "<div class=\"userPic\"><img src=\"" + get.byClass("current", get.byId("face"))[0].src + "\"></div>\
							 <div class=\"content\">\
							 	<div class=\"userName\"><a href=\"javascript:;\">" + oUserName.value + "</a>:</div>\
								<div class=\"msgInfo\">" + oConBox.value.replace(/<[^>]*>|&nbsp;/ig, "") + "</div>\
								<div class=\"times\"><span>" + format(oDate.getMonth() + 1) + "\u6708" + format(oDate.getDate()) + "\u65e5 " + format(oDate.getHours()) + ":" + format(oDate.getMinutes()) + "</span><a class=\"del\" href=\"javascript:;\">\u5220\u9664</a></div>\
							 </div>";
                    // 插入元素
                    aLi.length ? oUl.insertBefore(oLi, aLi[0]) : oUl.appendChild(oLi);

                    // 重置表单
                    get.byTagName("form", oMsgBox)[0].reset();
                    for (var i = 0; i < aImg.length; i++) aImg[i].className = "";
                    aImg[0].className = "current";

                    //将元素高度保存
                    var iHeight = oLi.clientHeight - parseFloat(css(oLi, "paddingTop")) - parseFloat(css(oLi, "paddingBottom"));
                    var alpah = count = 0;
                    css(oLi, {
                        "opacity": "0",
                        "height": "0"
                    });
                    timer = setInterval(function() {
                        css(oLi, {
                            "display": "block",
                            "opacity": "0",
                            "height": (count += 8) + "px"
                        });
                        if (count > iHeight) {
                            clearInterval(timer);
                            css(oLi, "height", iHeight + "px");
                            timer = setInterval(function() {
                                css(oLi, "opacity", (alpah += 10));
                                alpah > 100 && (clearInterval(timer), css(oLi, "opacity", 100))
                            }, 30)
                        }
                    }, 30);
                    //调用鼠标划过/离开样式
                    liHover();
                    //调用删除函数
                    delLi()
                }
            };

            //事件绑定, 判断字符输入
            EventUtil.addHandler(oConBox, "keyup", confine);
            EventUtil.addHandler(oConBox, "focus", confine);
            EventUtil.addHandler(oConBox, "change", confine);

            //输入字符限制
            function confine() {
                var iLen = 0;
                for (i = 0; i < oConBox.value.length; i++) iLen += /[^\x00-\xff]/g.test(oConBox.value.charAt(i)) ? 1 : 0.5;
                oMaxNum.innerHTML = Math.abs(maxNum - Math.floor(iLen));
                maxNum - Math.floor(iLen) >= 0 ? (css(oMaxNum, "color", ""), oCountTxt.innerHTML = "\u8fd8\u80fd\u8f93\u5165", bSend = true) : (css(oMaxNum, "color", "#f60"), oCountTxt.innerHTML = "\u5df2\u8d85\u51fa", bSend = false)
            }
            //加载即调用
            confine();

            //广播按钮鼠标划过样式
            EventUtil.addHandler(oSendBtn, "mouseover", function() {
                this.className = "hover"
            });

            //广播按钮鼠标离开样式
            EventUtil.addHandler(oSendBtn, "mouseout", function() {
                this.className = ""
            });

            //li鼠标划过/离开处理函数
            function liHover() {
                for (i = 0; i < aLi.length; i++) {
                    //li鼠标划过样式
                    EventUtil.addHandler(aLi[i], "mouseover", function(event) {
                        this.className = "hover";
                        oTmp = get.byClass("times", this)[0];
                        var aA = get.byTagName("a", oTmp);
                        if (!aA.length) {
                            var oA = document.createElement("a");
                            oA.innerHTML = "删除";
                            oA.className = "del";
                            oA.href = "javascript:;";
                            oTmp.appendChild(oA)
                        } else {
                            aA[0].style.display = "block";
                        }
                    });

                    //li鼠标离开样式
                    EventUtil.addHandler(aLi[i], "mouseout", function() {
                        this.className = "";
                        var oA = get.byTagName("a", get.byClass("times", this)[0])[0];
                        oA.style.display = "none"
                    })
                }
            }
            liHover();

            //删除功能
            function delLi() {
                var aA = get.byClass("del", oUl);

                for (i = 0; i < aA.length; i++) {
                    aA[i].onclick = function() {
                        var oParent = this.parentNode.parentNode.parentNode;
                        var alpha = 100;
                        var iHeight = oParent.offsetHeight;
                        timer = setInterval(function() {
                            css(oParent, "opacity", (alpha -= 10));
                            if (alpha < 0) {
                                clearInterval(timer);
                                timer = setInterval(function() {
                                    iHeight -= 10;
                                    iHeight < 0 && (iHeight = 0);
                                    css(oParent, "height", iHeight + "px");
                                    iHeight == 0 && (clearInterval(timer), oUl.removeChild(oParent))
                                }, 30)
                            }
                        }, 30);
                        this.onclick = null
                    }
                }
            }
            delLi();

            //输入框获取焦点时样式
            for (i = 0; i < aFtxt.length; i++) {
                EventUtil.addHandler(aFtxt[i], "focus", function() {
                    this.className = "active"
                });
                EventUtil.addHandler(aFtxt[i], "blur", function() {
                    this.className = ""
                })
            }

            //格式化时间, 如果为一位数时补0
            function format(str) {
                return str.toString().replace(/^(\d)$/, "0$1")
            }

            //头像
            for (i = 0; i < aImg.length; i++) {
                aImg[i].onmouseover = function() {
                    this.className += " hover"
                };
                aImg[i].onmouseout = function() {
                    this.className = this.className.replace(/\s?hover/, "")
                };
                aImg[i].onclick = function() {
                    for (i = 0; i < aImg.length; i++) aImg[i].className = "";
                    this.className = "current"
                }
            }
        });

    </script>
</head>

<body>
    <div id="msgBox">
        <form>
            <h2>来 , 说说你在做什么 , 想什么</h2>
            <div>
                <input id="userName" class="f-text" value="" />
                <p id="face"><img src="img/face1.gif" class="current" /><img src="img/face2.gif" /><img src="img/face3.gif" /><img src="img/face4.gif" /><img src="img/face5.gif" /><img src="img/face6.gif" /><img src="img/face7.gif" /><img src="img/face8.gif" /></p>
            </div>
            <div><textarea id="conBox" class="f-text"></textarea></div>
            <div class="tr">
                <p>
                    <span class="countTxt">还能输入</span><strong class="maxNum">140</strong><span>个字</span>
                    <input id="sendBtn" type="button" value="" title="快捷键 Ctrl+Enter" />
                </p>
            </div>
        </form>
        <div class="list">
            <h3><span>大家在说</span></h3>
            <ul>
                <li>
                    <div class="userPic"><img src="img/face.gif" /></div>
                    <div class="content">
                        <div class="userName"><a href="javascript:;">日丶久生情</a>:</div>
                        <div class="msgInfo">新增删除广播功能。</div>
                        <div class="times"><span>07月05日 15:14</span><a class="del" href="javascript:;">删除</a></div>
                    </div>
                </li>
                <li>
                    <div class="userPic"><img src="img/face.gif" /></div>
                    <div class="content">
                        <div class="userName"><a href="javascript:;">日丶久生情</a>:</div>
                        <div class="msgInfo">新增Ctrl+Enter快捷键发送广播。</div>
                        <div class="times"><span>07月05日 12:20</span><a class="del" href="javascript:;">删除</a></div>
                    </div>
                </li>
                <li>
                    <div class="userPic"><img src="img/face.gif" /></div>
                    <div class="content">
                        <div class="userName"><a href="javascript:;">日丶久生情</a>:</div>
                        <div class="msgInfo">新增选择头像功能。</div>
                        <div class="times"><span>07月05日 12:08</span><a class="del" href="javascript:;">删除</a></div>
                    </div>
                </li>
                <li>
                    <div class="userPic"><img src="img/face.gif" /></div>
                    <div class="content">
                        <div class="userName"><a href="javascript:;">日丶久生情</a>:</div>
                        <div class="msgInfo">增加了记录广播时间的功能。</div>
                        <div class="times"><span>07月04日 16:55</span><a class="del" href="javascript:;">删除</a></div>
                    </div>
                </li>
                <li>
                    <div class="userPic"><img src="img/face.gif" /></div>
                    <div class="content">
                        <div class="userName"><a href="javascript:;">日丶久生情</a>:</div>
                        <div class="msgInfo">增加了输入字符检测功能，英文/半角为半个字符，汉字/全角为一个字符。</div>
                        <div class="times"><span>07月04日 08:30</span><a class="del" href="javascript:;">删除</a></div>
                    </div>
                </li>
                <li>
                    <div class="userPic"><img src="img/face.gif" /></div>
                    <div class="content">
                        <div class="userName"><a href="javascript:;">日丶久生情</a>:</div>
                        <div class="msgInfo">仿腾讯微博效果，欢迎大家测试！</div>
                        <div class="times"><span>07月03日 20:19</span><a class="del" href="javascript:;">删除</a></div>
                    </div>
                </li>
            </ul>
        </div>
    </div>
</body>

</html>
